Under Plone 3.1 and running the latest p4acal.buildout, the following error occurs when clicking on the day view.

Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 42, in call_object
  Module Products.Five.browser.metaconfigure, line 417, in __call__
  Module Shared.DC.Scripts.Bindings, line 313, in __call__
  Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
  Module Products.PageTemplates.PageTemplateFile, line 129, in _exec
  Module Products.PageTemplates.PageTemplate, line 89, in pt_render
  Module zope.pagetemplate.pagetemplate, line 117, in pt_render
  Module zope.tal.talinterpreter, line 271, in __call__
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 891, in do_useMacro
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 957, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 861, in do_defineMacro
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 957, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 534, in do_optTag_tal
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 949, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 586, in do_setLocal_tal
  Module zope.tales.tales, line 696, in evaluate
   - URL: index
   - Line 10, Column 0
   - Expression: <PathExpr standard:'view/calcInfo'>
   - Names:
      {'container': <ATFolder at /cal/calendar>,
       'context': <ATFolder at /cal/calendar>,
       'default': <object object at 0x55530>,
       'here': <ATFolder at /cal/calendar>,
       'loop': {},
       'nothing': None,
       'options': {'args': (<Products.Five.metaclass.SimpleViewClass from /Users/nateaune/Documents/instances/p4acal.buildout/src/dateable.chronos/dateable/chronos/browser/day.pt object at 0x8ab50d0>,)},
       'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x80690f8>,
       'request': <HTTPRequest, URL=http://localhost:8080/cal/calendar/day.html>,
       'root': <Application at >,
       'template': <ImplicitAcquirerWrapper object at 0x8ab5410>,
       'traverse_subpath': [],
       'user': <PropertiedUser 'admin'>,
       'view': <Products.Five.metaclass.SimpleViewClass from /Users/nateaune/Documents/instances/p4acal.buildout/src/dateable.chronos/dateable/chronos/browser/day.pt object at 0x8ab50d0>,
       'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0x8ab51b0>}
  Module zope.tales.expressions, line 217, in __call__
  Module Products.PageTemplates.Expressions, line 161, in _eval
  Module Products.PageTemplates.Expressions, line 123, in render
  Module dateable.chronos.browser.day, line 61, in calcInfo
AttributeError: getHoursToView